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\fIcurl_multi_perform(3)\fP) - to allow libcurl to keep timeouts and retries
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etc to work. A timeout value of -1 means that there is no timeout at all, and
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0 means that the timeout is already reached. Libcurl attempts to limit calling
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\fICURLMOPT_TIMERDATA\fP. This callback can be used instead of, or in addition
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to, \fIcurl_multi_timeout(3)\fP. (Added in 7.16.0)